That's amazing - what happens when 2 cars travelling in opposite directions meet in the middle of such as stretch? does one of them reverse for a mile or so? How do they negotiate this? Are you seriously saying that it is dangerous for a cyclist to pull over to the side of such roads and come to a halt? I'm staying away from the fens if that's the case!
It is an amazing and beautiful landscape.
If two cars meet in the middle, then it's a failure of observation and action by both parties because those sections of fen road are usually long, straight and without close hedges, so you just pull over when you can before meeting oncoming traffic and wait - sometimes for a couple of minutes. You can't really drive the small fen roads in a rush - there are wider roads and even A and B roads for through motor traffic.
When two do meet, usually whoever is nearest or most manoeuvrable reverses to somewhere they can pull in. Farm entrances are usable by cars on wide low-pressure tyres, just like they are by MTBs, but a narrow high-pressure road bike tyre often sinks in.
I've not yet met an oncoming car on the fens when I've needed to reverse very far, but I have reversed a half-mile or more near a river crossing in mid-Norfolk. You just do it: if you're in a rush, you shouldn't be on such narrow lanes.
It really can be dangerous for a cyclist on a road bike to get near the edge of some of fen roads. They often have drains along both sides and the road edges can be ill-defined and unstable for various reasons. If you try to ride onto the verge in a road bike, you may well be getting wet, as what looks like a verge is sometimes just long grass at the top of the drain bank.
They're dangerous for motorists too. Several have died from straying off the road for some reason (usually suspected to be excessive speed), rolled into a drain and couldn't get out because their doors wedged shut against the banks. Basically, bad driving around here still risks a death penalty.
It's still good to cycle in the fens, though. There's plenty of small roads where most motorists are deterred by the death penalty, you can usually see and hear the remainder coming a long way off and most of them are relaxed and polite. The winds are a far stiffer challenge!
or the driver behind wants to overtake, pull into a passing place on your left, or wait opposite a passing place on your right.
Yebbut the reference to "grassy" makes me think they weren't passing places with the white square/diamond signs.
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